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Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income	$ 1,328	$ 3,120	$ 477	$ 2,502	$ 4,448	$ 2,979
Denominator:
Weighted average common shares - basic (in shares)	12,003,000		12,462,000		11,959,000	12,462,000
Effect of dilutive securities: stock options (in shares)	275,000		318,000		292,000	160,000
Weighted average common shares - diluted (in shares)	12,278,000		12,780,000		12,251,000	12,622,000
Net income per share - basic (in dollars per share)	$ 0.11		$ 0.04		$ 0.37	$ 0.24
Net income per share - diluted (in dollars per share)	$ 0.11		$ 0.04		$ 0.36	$ 0.24
Anti-dilutive shares not included in computation of net income (loss) per common share (in shares)	200,000		300,000		200,000	300,000

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